A breathalyzer is a device used to estimate the blood alcohol content of a suspected drunk driver by measuring the amount of alcohol in one's breath. The fuel cell breathalyzer employs the reaction below CH_3 CH_2 OH (g) + O_2 (g) rightarrow HC_2 H_3 O_2 (g) + H_2 O(g) When a suspected drunk driver blows his or her breath through the fuel-cell breathalyzer, the device measures the current produced by the reaction and calculates the percent alcohol in the breath. Part A How many moles of electrons are transferred per mole of ethanol, CH_3 CH_2 OH, in the reaction? Part B When a suspected drunk driver blows 189 mL of his breath through the fuel-cell breathalyzer, the breathalyzer produces an average of 328 mA of current for 10 s. 1 mA = 0.001 A Assuming a pressure of 1.0 atm and a temperature of 25 degree C, what percent (by volume) of the drivers breath is ethanol? Express your answer using two significant figures.